Deckle grinder

ABSTRACT

Deckle grinding apparatus is described wherein a web of material, such as paper, is wrapped approximately 180* around a support drum so one or both edges overhang the drum. Tension is applied to the web to provide increased strength to permit a grinding wheel at an angle to the longitudinal axis of the drum to grind a deckle on the edge of the web.

United States Patent [1 1 Fletcher [4 1 Dec. 17,1974

[ DECKLE GRINDER [75] Inventor: Wade D. Fletcher, Hartsville, SC.

[73] Assignee: Sonoco Products Company,

l-lartsville, SC.

[22] Filed: July 9, 1973 [21] Appl. No.: 377,368

[52] US. Cl. 51/75, 91/1 G [51] Int. Cl B24d 7/00, B24d 9/00 [58] Fieldof Search 51/74-78, 110;

[56] References Cited UNlTED STATES PATENTS 2,217,306 10/1940 Burrill51/75 2,392,375 l/1946 Gardella 51/78 Primary ExaminerOthell M. SimpsonAttorney, Agent, or Firm--C. Gordon McBride 5 7 ABSTRACT Deckle grindingapparatus is described wherein a web of material, such as paper, iswrapped approximately 180 around a support drum so one or both edgesoverhang the drum. Tension is applied to the web to provide increasedstrength to permit a grinding wheel at an angle to the longitudinal axisof the drum to grind a deckle on the edge of the web.

8 Claims, 3 Drawing Figures DECKLE GRINDER This application is directedto deckle grinding apparatus and more particularly to such apparatus forgrinding the edge of a web of paper at a specific angle and dimension.

It has long been a problem in preparing webs of material such as paperwhich are to be used in production of spiral tubes or containers thatthe edge of the plies that overlap the next below ply have a substantialraised portion caused by the overlap. It has also been difficult toprovide a butt joint that does not leave a space and thereby causeweakening of the tube or can body. In order to avoid these difficulties,it has been suggested that the edge of the ply or web be deckled orskived such that it is angled to the plane of the surface of the web ofmaterial.

Various apparatus has been suggested which can be utilized for thispurpose. However, the known apparatus does not skive or deckle the edgeof the paper such that there is a smooth, even outer edge and theequipment is quite cumbersome and expensive. Furthermore, the knownequipment is difficult of use in-line with a relatively rapidlyproducing converting operation.

In order to overcome the above disadvantages, the instant inventioncontemplates the utilization of a drum aroundwhich the web of materialis passed under tension. A powered grinding wheel is mounted at an anglesuch that the desired amount of angle and paper is removed during thegrinding operation.

Reference is now made to the drawings wherein like numerals refer to thesame or similar parts and wherein the invention may be best understoodby reference to the following description taken in conjunction with theaccompanying drawings in which:

FIG. 1 is a front view of the instant apparatus;

FIG. 2 is a diagrammatic side elevational view of the invention withportions removed for clarity; and

FIG. 3 is a front elevational view of a modification of the instantinvention.

Referring now to the drawings and more specifically FIGS. 1 and 2wherein deckle grinder 10 is shown in a position for deckling a web 12of material such as paper. Support drum 14 is substantially cylindricalhaving circular outer surface 16. Drum 14 is mounted on a framework 18,a portion of which is omitted for clarity, including shaft 29 andbearings 31. As best seen in FIG. 1, drum 14 may have a pair ofdisk-like elements 15 for more accurate control and greater operationalefficiency.

Grinder 20 includes grinding wheel 22 which is powered by conventionalmotor 24. Motor 24 is adjustably supported from framework 18 by supportelements or bearings 26 in an adjustable manner to permit the rotationof the grinding wheel 22 as observed in FIG. 1.

Web guide bars 28 and 30 on the supply and converting sides of drum 14,respectively, are mounted adjacent to, but spaced from drum surface 16.Generally it is preferable to have guide bars 28 and 30 mounted slightlyabove centerline 17 of drum 14. This permits the appropriate locationand maintenance of tension on web 12 as it passes around drum 14.

As best seen in FIG. 1, a portion of web 12 extends beyond the end ofdrum 14 to provide a web overhanging edge 32. A portion of overhang 32is ground away by grinding wheel 22 to provide deckled portion 34.

Tension device 36 is provided between guide bar 28 and the web supplywhich is not shown, but may be of any conventional construction.

Referring now to FIG. 3, an alternative arrangement of the instantinvention is shown as having a narrow drum 42 which is of lesslongitudinal length than the width of web 50. A pair of grinding wheels44 and 46 are mounted similarly to wheel 22 shown in FIG. 1 to grindoverhangs 52 of web 50 and thereby provide deckles on each side of web50. Guide bar 48 is shown in a position similar to that for guide bar 30in FIG. 2.

The adjustable mechanism for mounting grinding wheel 22 and its drivemotor 24 are shown in FIG. 1. Supporting framework 18 includes a flathorizontal surface 19 on which is mounted slide 60. Slide has feet 61which slide along surface 19. Extending upwardly from slide body 60 arearms 62 receiving pivot projections 65. Near the other end of slide body60 are located upright projections 63 for receiving pivot bars 72 formounting of motor mount 74. Motor mount 74 includes downwardly directedlegs 76 which also receive pivot bar 72 to permit motor mount 74 andmotor 24 to pivot about bar 72 in the plane of the drawing as viewed inFIG. 1.

Arms 62 receive pivot projections 65 which extend from eccentric shaft64. Handle 66 permits the rotation of shaft 64 to raise or lower motormount 74 which contacts one surface of shaft 64. A pair of support legs71 extend upwardly from support frame 18 to receive threaded shaft 68which has handle 70 attached to one end. This construction permitsrotation of handle 70 to move slide 60 to the right or left as viewed inFIG. 1. This adjustment permits the movement of grinding wheel 22 towardor away from drums 14 or 42. Rotation of handle 66 raises or lowersgrinding wheel 22 and, in conjunction with handle 70, permits anaccurate location of grinding wheel 22 to provide for the deckling of aproper amount of web 12.

In operation, web 12 passes from the supply location through tensiondevice 36, around guide'bar 28 onto surface 16 of drum 14 around whichit is wrapped approximately l. Web 12 then passes over guide bar 30 andto the converting operation or a rewind apparatus, not shown. As web 12passes over drum 14, it is put into an arcuate position to therebyprovide strength and rigidity to the web such that grinding wheel 22 maygrind a portion of overhang 32 to form the deckle 34. It is noted thatgrinding wheel 22 is of a dimension less in diameter than the diameterof support drum 14 to permit only a portion of grinding wheel 22 toencounter overhand 32. As web 12 passes grinding wheel 22, a portion isremoved to form deckle 34.

Thus it is seen that the instant apparatus provides an economical,simple and compact apparatus for deckling the edge of a web of materialsuch as paper. The apparatus is capable of use in-line with variouspieces of equipment such as spiral winding machines. Utilization of theeasily controlled tension device 36 and modification of the angle ofgrinding wheel 22 provide the desired thickness and angle for thedeckle. The instant apparatus avoids the use of a back-up plate with theattendant wear and potential damage to web 12 and also provides a smoothlinear edge on web 12.

What is claimed is:

l. A deckle grinder comprising: means for supporting a moving web ofmaterial in an arcuate configuration; grinding means for removing aportion of the edge of the arcuate section of the web to provide adeckle; said grinding means mounted at an angle to said supporting meansand within said arcuate section of said web, whereby a portion of theweb may be removed by the grinding means to provide a uniform andproperly angled deckle on the edge of the web.

2. The deckle grinder of claim 1 wherein said support means includes adrum around a portion of the exterior surface of which is passed amoving web of material.

3. The deckle grinder of claim 1 wherein said grinding means is of lessradial dimension than that of said support means.

4. The deckle grinder of claim 1 wherein said support means comprises acylindrical drum and said grinding means comprises a grinding wheelmounted for contact with the edge of the web which overhangs the end ofsaid drum.

5. The deckle grinder of claim 4 wherein said grinding wheel is of lessdiameter than the drum.

6. A deckle grinder comprising a cylindrical drum adapted to support amoving web of paper around a portion of its exterior surface; a grindingwheel; means for rotating said grinding wheel; said grinding wheel .ofless diameter than said drum and mounted at an angle to the longitudinalaxis and end thereof; and means for supporting the web as it approachesand departs from said drum, whereby a portion of the web overhangs theend of said drum and contacts the edge of said wheel such that a portionof the overhanging web is removed.

7. The deckle grinder of claim 6 wherein are provided supporting meansfor the web as it approaches and departs from said drum; and saidsupporting means adjacent to and spaced from the exterior surface ofsaid drum.

8. The deckle grinder of claim 6 wherein said supporting means comprisea pair of guide bars; at least one of said bars being adjacent butspaced from the exterior surface of said drum to support the web priorto the latter encountering said drum; and another of said guide barsadjacent to but spaced from said drum approximately l around said drumfrom said first guide bar.

1. A deckle grinder comprising: means for supporting a moving web ofmaterial in an arcuate configuration; grinding means for removing aportion of the edge of the arcuate section of the web to provide adeckle; said grinding means mounted at an angle to said supporting meansand within said arcuate section of said web, whereby a portion of theweb may be removed by the grinding means to provide a uniform andproperly angled deckle on the edge of the web.
 2. The deckle grinder ofclaim 1 wherein said support means includes a drum around a portion ofthe exterior surface of which is passed a moving web of materIal.
 3. Thedeckle grinder of claim 1 wherein said grinding means is of less radialdimension than that of said support means.
 4. The deckle grinder ofclaim 1 wherein said support means comprises a cylindrical drum and saidgrinding means comprises a grinding wheel mounted for contact with theedge of the web which overhangs the end of said drum.
 5. The decklegrinder of claim 4 wherein said grinding wheel is of less diameter thanthe drum.
 6. A deckle grinder comprising a cylindrical drum adapted tosupport a moving web of paper around a portion of its exterior surface;a grinding wheel; means for rotating said grinding wheel; said grindingwheel of less diameter than said drum and mounted at an angle to thelongitudinal axis and end thereof; and means for supporting the web asit approaches and departs from said drum, whereby a portion of the weboverhangs the end of said drum and contacts the edge of said wheel suchthat a portion of the overhanging web is removed.
 7. The deckle grinderof claim 6 wherein are provided supporting means for the web as itapproaches and departs from said drum; and said supporting meansadjacent to and spaced from the exterior surface of said drum.
 8. Thedeckle grinder of claim 6 wherein said supporting means comprise a pairof guide bars; at least one of said bars being adjacent but spaced fromthe exterior surface of said drum to support the web prior to the latterencountering said drum; and another of said guide bars adjacent to butspaced from said drum approximately 180* around said drum from saidfirst guide bar.